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You searched for: creator:"Maina"
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[audio]Maina - Maina
Ola Calma. Demo debut. 2004. De una habitación a otra, los samplers, las ideas, las vivencias fluyeron, y con ello, el paso de gente que dejo su rastro sonoro en cinco temas bajo el título de Ola Cälma. Maina continuará como experimento nómada de vivencias sonoras.a Art de San Lorenzo. El eje central esta compuesto por Maureen Kinnear a la voz, Isaac Cordal e Ig en las composiciones, samplers y arreglos, con la colaboración de Rudie Clowntamination.
Keywords: Electronica
Downloads: 3,586 5.00 out of 5 stars5.00 out of 5 stars5.00 out of 5 stars5.00 out of 5 stars5.00 out of 5 stars(1 review)
[audio]Maina - Maina
Maina. Ola Calma. Demo debut. 2004. For more info write to: Isaac-cordal@bandua.com cordial1974@mixmail.com www.alg-a.com
Keywords: Electronic
Downloads: 2,332
[audio]Maina - Maina
Maina is a musical project made during the winter of 2004 in the house of Art of San Lourenzo in Santiago de Compostela (Spain).
Keywords: Electronic
Downloads: 750
[audio]Maina - Ola Calma EP [alg002] - Maina
De una habitación a otra, los samplers, las ideas, las vivencias fluyeron, y con ello, el paso de gente que dejo su rastro sonoro en cinco temas bajo el título de Ola Cälma. Maina continuará como experimento nómada de vivencias sonoras. El eje central esta compuesto por Maureen Kinnear a la voz, Isaac Cordal e Ig en las composiciones, samplers y arreglos, con la colaboración de Rudie Clowntamination.
Keywords: Electronica; Post Rock; Post-rock
Downloads: 7,891
[audio]Maina - Ola Calma [nsh068] - Maina
"Hi, I'm yesterday, and today I'm looking for tomorrow." Ola Calma by Maina is an intoxicating blend of vocal and electronic experimentalism, which shifts frequently and effortlessly between calm and aggression.
Keywords: Electronic; Vocal; Experimental
Downloads: 8,472
[audio]Maina - Maina

Keywords: Electronic
Downloads: 711
[texts]Multiple Parton Interactions in Z+4j, W\pm W\pm +0/2j and W+ W- +2j production at the LHC - Ezio Maina
The expected rate for Multiple Parton Interactions (MPI) at the LHC is large. This requires an estimate of their impact on all measurement foreseen at the LHC. Conversely it provides new means of studying MPI at the LHC. In this paper we examine the role of MPI at the LHC, with the design energy of 14 TeV, in - Z production in association with four jets, - W\pm W\pm in association with zero or two jets...
Downloads: 2
[texts]Multiple Parton Interactions, top--antitop and W+4j production at the LHC - Ezio Maina
The expected rate for Multiple Parton Interactions (MPI) at the LHC is large. This requires an estimate of their impact on all measurement foreseen at the LHC while opening unprecendented opportunities for a detailed study of these phenomena. In this paper we examine the MPI background to top-antitop production, in the semileptonic channel, in the early phase of data taking when the full power of $b$--tagging will not be available...
Downloads: 2
[texts]Multiple Parton Interactions in Z+jets production at the LHC. A comparison of factorized and non--factorized double parton distribution functions - Ezio Maina
We examine the contribution of Multiple Parton Interactions to Z+n-jets production at the LHC, n=2,3,4, where the Z boson is assumed to decay leptonically. We compare the results obtained with the correlated GS09 double parton distribution function with those obtained with two instances of fully factorized single parton distribution functions: MSTW2008LO and CTEQ6LO. It appears quite feasible to measure the MPI contribution to Z+2/3/4 jets already in the first phase of the LHC with a total lumin...
[texts]NLO QCD corrections to the production of off--shell WW pairs at $e^+ e^-$ colliders - E. Maina
QCD corrections to $e^+e^- \ra WW \ra q_1 \bar q_1 q_2 \bar q_2$ are computed and presented in a form which allows to impose realistic cuts on the structure of the observed events. QCD radiation substantially modifies the jet--jet invariant mass distributions from which the value of the $W$ mass will be extracted. When the range of allowed jet--jet masses is restricted, as it has been proposed in order to suppress non--$WW$ backgrounds, the total cross section is also deeply affected...
Downloads: 2
[texts]Five Jet Production with Heavy Quarks at $e^+ e^-$ Colliders - A. Ballestrero
Heavy quark production in five jet events at $e^+e^-$ colliders is studied at tree level using helicity amplitudes. Total production rates for $2b3j$ and $4bj$ are given and compared with the corresponding results for massless quarks. The process $e^+e^-\rightarrow q\bar q gg\gamma$ which is the dominant contribution to $4j\gamma$ production is briefly discussed.
Downloads: 2
[texts]Pion Compton Scattering in Perturbative QCD - E. Maina
Pion Compton scattering is studied in perturbative QCD for real and space--like initial photons. Different methods for the convolution of the hard amplitude with the pion wave--functions, which have in the past led to conflicting results, are compared.
Downloads: 1
[texts]Effects of jet algorithms from higher order QCD in $W^\pm$ mass determinations at LEP2 - E. Maina
We analyse the impact of systematic effects due to the scale dependence of QCD corrections in combination with the use of different jet clustering algorithms in the measurement of the $W^\pm$ mass in the fully hadronic decay mode of $W^+W^-$ pairs produced at LEP2. We consider higher order contributions induced by both virtual and real gluon radiation onto the electroweak CC03 and CC11 channels through ${\cal O}(\alpha_{s})$ at the parton level...
Downloads: 4
[texts]A New Method for Computing Helicity Amplitudes - A. Ballestrero
An helicity formalism for perturbative calculations is presented. It is based on the formal insertion in spinor lines of a complete set of states built up with unphysical spinors. It is particularly convenient when massive spinors are present. Its application to $e^+\,e^-\,\rightarrow b\,\bar b\,W^+W^-$ is briefly discussed.
Downloads: 3
[texts]QCD corrections to the production of a heavy quark pair plus a hard photon in $e^+ e^-$ annihilation - L. Magnea
We present complete results for the $O(\alpha_s)$ corrections to the production of a heavy quark pair plus a hard photon, in $e^+ e^-$ annihilation, including both photon and $Z$ intermediate states. Virtual corrections are calculated analytically in $4 - 2 \epsilon$ dimensions, together with the soft approximation to the real emission diagrams. After cancellation of infrared divergences, real and virtual contributions are combined numerically to obtain the cross section for the production of tw...
Downloads: 5
[texts]A New Method for Helicity Calculations - A. Ballestrero
We propose a new helicity formalism based on the formal insertion in spinor lines of a complete set of states build up with unphysical spinors. The method is developed both for massless and massive fermions for which it turns out to be particularly fast. All relevant formulae are given.
Downloads: 8
[movies]Perspectives On Human Transformation - Adisaji Maina Omar/Carlos Romero
9/9/2009 The first in a series of IkoVision Blog Talk Radio show hosted by Carlos Romero on Adisaji Maina Omar from the Ikologiks Organization. First topic being Perspectives On Human Transformation
Keywords: transformation; IkoVisionsMeditation; chant; om
Downloads: 51
[texts]Heavy Quark Production at $e^+ e^-$ Colliders in Multijet Events and a New Method of Computing Helicity Amplitudes - Alessandro Ballestrero
Heavy quark production in multijet events at $e^+e^-$ colliders is studied at tree level. Total production rates are given and compared with the corresponding results for massless quarks. A new method of computing helicity amplitudes is briefly sketched. Talk presented at the XXIXth Rencontres de Moriond, QCD and High Energy Hadronic Interactions, Meribel, France, March 19-26 1994.
[texts]Heavy Quarks and Leptons at $e^+e^-$ Colliders - A. Ballestrero
The production of massive quarks and leptons in $e^+e^-$ collisions is studied using exact helicity amplitudes. Total cross sections as a function of $y_{\rm cut}$, in both the JADE and the $k_T$ algorithms, are presented and compared with massless results. Some invariant mass distributions are examined in relation to Higgs detection. Compact expressions for the helicity amplitudes are given.
Downloads: 3
[texts]QCD corrections to $e^+ e^- \to u~\bar d~s~\bar c$ at Lep 2 and the Next Linear Collider: CC11 at O(α_s) - E. Maina
QCD one-loop corrections to the full gauge invariant set of electroweak diagrams describing the hadronic process $e^+ e^- \to u~\bar d~s~\bar c$ are computed. Four-jet shape variables for $WW$ events are studied at next-to-leading order and the effects of QCD corrections on the determination of the $W$--mass in the hadronic channel at Lep 2 and NLC is discussed. We compare the exact calculation with a ``naive''approach to strong radiative corrections which has been widely used in the literature.
[texts]Weak Corrections to Three-Jet Production in Electron-Positron Annihilations: 1) The Factorisable Contributions - E. Maina
We report on the calculation of the factorisable one-loop weak-interaction corrections to the initial and final states for three-jet observables in electron-positron annihilations. We show that such corrections are of a few percent at $\sqrt s=M_Z$. Hence, while their impact is not dramatic in the context of LEP1 and SLC, where the total error on the measured value of $\alpha_{\mathrm{S}}$ is larger, at a future Linear Collider, running at the $Z$ mass peak (e.g., GigaZ), they ought to be taken ...
[texts]PHASE - An event generator for six fermion physics at the LHC - E. Accomando
PHASE is a Monte Carlo event generator, under construction, for all Standard Model processes with six fermions in the final state at the LHC. It employs the full set of tree level Feynman diagrams, taking into account fermion masses for b quarks. The program can generate unweighted events for any subset of all six fermion final states in a single run, by making use of dedicated pre-samples. An interface to hadronization is provided.
Downloads: 2
[texts]PHASE, a Monte Carlo event generator for six-fermion physics at the LHC - E. Accomando
PHASE is a new event generator dedicated to the study of Standard Model processes with six fermions in the final state at the LHC. The code is intended for analyses of vector boson scattering, Higgs search, three gauge boson production, and top physics. This first version of the program describes final states characterized by the presence of one neutrino, $pp\to 4q +l\nu_l$, at O($\alpha^6$). PHASE is based on a new iterative-adaptive multichannel technique, and employs exact leading order matri...
[texts]CC10 at ${\cal O}(α_s )$: QCD corrections to $e^+ e^- \to μ^- \bar ν_μu \bar d$ at LEP2 and the Next Linear Collider - E. Maina
QCD one-loop corrections to the semileptonic process $e^+ e^- \to \mu^- \bar \nu_\mu u \bar d$ are computed. We compare the exact calculation with a ``naive'' approach to strong radiative corrections which has been widely used in the literature and discuss the phenomenological relevance of QCD contributions for LEP2 and NLC physics.
Downloads: 2
[texts]Hard Photon Pair Production at LEP - A. Ballestrero
The production of photon pairs in $e^+e^-\rightarrow f \bar f \gamma\gamma$ processes is studied using exact helicity amplitudes at tree level. Total cross sections, including initial state radiation effects, are given. They are presented in the case of quarks as a function of $y_{\rm cut}$ in the JADE algorithm. In the case of leptons we use cuts similar to the ones employed in a recent L3 analysis...
Downloads: 1
[texts]One-loop weak corrections to $γ/Z$ hadro-production at finite transverse momentum - E. Maina
We illustrate the effects of one-loop weak corrections onto the production of neutral gauge bosons of the Standard Model at RHIC-Spin, Tevatron and LHC, in presence of quark/gluon radiation from the initial state. We find such effects to be rather large, up to ${\cal O}(10-20%)$ in typical observables at all such colliders, where the cross section is measurable, thus advocating their inclusion in precision analyses
Downloads: 3
[texts]A new analysis of PP --> bblvjj at the LHC: Higgs and W boson associated production with two tag jets - Alessandro Ballestrero
Higgs production in association with a $W$ boson and two energetic tag jets at the LHC is studied for $M_H = 120$ \GeV, with the Higgs decaying to $b\bar{b}$ and the $W$ to $\ell\nu$ ($\ell = e, \mu$), guaranteeing high trigger efficiency. All parton level backgrounds are analyzed, including the effect of fake $b$--tagging. We discuss two detection strategies: in the first, more traditional, one, two jets are required to be $b$--tagged while in the second, which has not been previously examined ...
Downloads: 2
[texts]One-loop weak corrections to three-jet observables at the Z pole - E. Maina
We briefly illustrate the impact of the genuinely weak one-loop virtual terms of the ${\cal O}(\alpha_{\rm S}\alpha_{\rm EW}^3)$ factorisable corrections to the three-jet cross section at $\sqrt s=M_Z$. Their importance for the measurement of $\alpha_{\rm S}$ at GigaZ luminosities is emphasised
Downloads: 3
[texts]WPHACT 2.0: A fully massive Monte Carlo generator for four fermion physics at e^+ e^- colliders - E. Accomando
WPHACT 2.0 is the new fully massive version of a MC program and unweighted event generator which computes all Standard Model processes with four fermions in the final state at e^+ e^- colliders. The program can now generate unweighted events for any subset of all four fermion final states in a single run, by making use of dedicated pre-samples which can cover the entire phase space. Improvements with respect to WPHACT 1.0 include the Imaginary Fermion Loop gauge restoring scheme, new phase space...
Downloads: 3
[texts]$b \bar b W^+ W^-$ production at hadron colliders. Top signal and irreducible backgrounds - A. Ballestrero
We compute complete tree level matrix elements for $gg , q \bar q \rightarrow b \bar b W^+W^-$. We analyze the irreducible backgrounds to top signal at the Tevatron and at the LHC. Their contribution to the total cross section is about $5 \%$ at the LHC, due to single resonant channels. Several distributions with contributions from signal and backgrounds are presented.
Downloads: 3
[texts]Higgs Production and Decay via $e^+e^-\rightarrow Z^0 H^0 \rightarrow b\bar bW^+W^-$ and Irreducible Backgrounds at the Next Linear Collider - A. Ballestrero
The complete matrix element for $e^+e^-\ar b\bar bW^+W^-$ has been computed at tree--level and applied to $Z^0H^0$ production followed by $Z^0\ar b\bar b$ and $H^0\ar W^+W^-$, keeping into account all irreducible backgrounds, which are dominated by \ttb production, at the Next Linear Colliders. We find that, depending on the center of mass energies and on the search strategies, this channel can be useful for the study of the parameters of the Standard Model Higgs boson over the most part of the ...
Downloads: 2
[texts]QCD corrections to charged current processes at the Next Linear Collider: CC10, CC11 and CC20 at O(alpha_s) - E. Maina
One-loop QCD corrections to the full gauge invariant set of electroweak diagrams describing the charged current processes $e^+ e^- \to u \bar d \mu \bar\nu_\mu$ (CC10), $e^+ e^- \to u \bar d e^- \bar\nu_e$ (CC20) and $e^+ e^- \to u \bar d s \bar c$ (CC11) are computed. We compare the exact calculation with a ``naive''approach to strong radiative corrections which has been widely used in the literature and discuss the phenomenological relevance of QCD corrections for NLC physics.
Downloads: 11
[texts]A complete parton level analysis of boson-boson scattering and ElectroWeak Symmetry Breaking in lv + four jets production at the LHC - Alessandro Ballestrero
A complete parton level analysis of lv + four jets production at the LHC is presented, including all processes at order O(alpha^6), O(alpha^4*alpha_s^2) and O(alpha^2*alpha_s^4). The infinite Higgs mass scenario, which is considered as a benchmark for strong scattering theories and is the limiting case for composite Higgs models, is confronted with the Standard Model light Higgs predictions in order to determine whether a composite Higgs signal can be detected as an excess of events in boson--bo...
Downloads: 5
[texts]Non-conserved currents and gauge-restoring schemes in single W production - Elena Accomando
We generalize the inclusion of the imaginary parts of the fermionic one-loop corrections for processes with unstable vector bosons to the case of massive external fermions and non conservation of weak currents. We study the effect of initial and final state fermion masses in single W production in connection with the gauge-invariant treatment of the finite-width effects of W and Z bosons, giving numerical comparisons of different gauge-invariance-preserving schemes in the energy range of LEP2 an...
Downloads: 4
[texts]Brazil: Democracy and Inclusive Growth - Simon Schwartzman, Maina Celidonio de Campos
Written for "Democracy Works", a Project of the Centre for Development and Enterprise (South Africa) and Legatum Institute (London), with the support of the Centre for Policy Research (India) and Instituto de Estudos do Traballho e Sociedade (Brasil). A synthesis of the Brazilian part of the project is available as Brazil and the Pursuit of Inclusive Growth and the projects' final report is availabe as The Democratic Alternative from the South : India, Brazil and South Africa ...
Keywords: Brazil; Democracy; Social Development
Downloads: 16
[audio]FRAGORNA med The Sweptaways - Pernilla Soderberg, Maina Arvas, Ellen von Zweigbergk
FRAGORNA med The Sweptaways Ett poddradiosamtal dar The Sweptaways staller de viktiga fragorna. Och svarar pa dem. Det ar tidig vardagsmorgon pa Gunnarssons Specialkonditori i Stockholm. Tva kordamer i The Sweptaways dricker kaffe med en tredje. Denna far valja ut tre fragor som hon vill svara pa. Bland kaffekopparna pa bordet ligger alltid samma papper med samma fragor, men i varje avsnitt ar det en ny kordam som valjer och svarar...
Keywords: FRA…GORNA; The Sweptaways; poddradiosamtal; Gunnarssons Specialkonditori, musik, livet
Downloads: 387
[texts]Vector-Vector scattering at the LHC with two charged leptons and two neutrinos in the final state - Alessandro Ballestrero
A complete parton level analysis of 2l2v2j and 4l2j, l = mu,e production at the LHC is presented, including all processes at order alpha^6, alpha^4*alpha_s^2. The infinite Higgs mass scenario, which is considered as a benchmark for strong scattering theories and is the limiting case for composite Higgs models, and one example of Strongly Interacting Light Higgs models are confronted with the Standard Model light Higgs predictions...
Downloads: 5
[texts]Exploring alternative symmetry breaking mechanisms at the LHC with 7, 8 and 10 TeV total energy - Alessandro Ballestrero
In view of the annnouncement that in 2012 the LHC will run at 8 TeV, we study the possibility of detecting signals of alternative mechanisms of ElectroWeak Symmetry Breaking, described phenomenologically by unitarized models, at energies lower than 14 TeV. A complete calculation with six fermions in the final state is performed using the PHANTOM event generator. Our results indicate that at 8 TeV some of the scenarios with TeV scale resonances are likely to be identified while models with no res...
Downloads: 4
[texts]Boson boson scattering at LHC - Elena Accomando
We analyse some features of WW scattering processes at LHC. The severe cancellations between fusion diagrams and the other contributions evidence the necessity of complete calculations for studying the high WW invariant mass region and disentangling the standard Higgs case from new physics.
[texts]Weak Corrections to Hadronic Observables - E. Maina
We illustrate one-loop weak corrections to three-jet production in $e^+e^-$ at $\sqrt{s}=M_Z$, to the production of a $Z$ or $\gamma$ in association with a hard jet at hadron colliders and to the production cross section of two $b$-jets at Tevatron and Large Hadron Collider (LHC).
Downloads: 2
[texts]Boson Fusion and Higgs production at the LHC in six fermion final states with one charged lepton pair - E. Accomando
Boson boson scattering and Higgs production in boson boson fusion will be actively investigated at the LHC. We have performed a parton level study of all processes of the type $q_1 q_2 \to q_3 q_4 q_5 q_6 l^+l^-$ using for the first time a full fledged six fermion Monte Carlo event generator which employs exact matrix elements at $\O(\alpha_{em}^6)$. We have examined Higgs production in vector boson fusion followed by the decay chain $H\to ZZ\to l^+l^-jj$, including exactly all electroweak irred...
Downloads: 5
[texts]PHANTOM: a Monte Carlo event generator for six parton final states at high energy colliders - A. Ballestrero
PHANTOM is a tree level Monte Carlo for six parton final states at proton--proton, proton--antiproton and electron--positron collider at O(alpha_ew^6) and O(alpha_ew^4*alpha_s^2) including possible interferences between the two sets of diagrams. This comprehends all purely electroweak contribution as well as all contributions with one virtual or two external gluons. It can generate unweighted events for any set of processes and it is interfaced to parton shower and hadronization packages via the...
Downloads: 3
[texts]One-loop weak corrections to the $b\bar b$ cross section at TeV energy hadron colliders - E. Maina
We investigate one-loop weak corrections to the production cross section of two $b$-jets at Tevatron and Large Hadron Collider (LHC). We establish that they are small at inclusive level but dominant in exclusive observables that have a non-trivial dependence on the helicity structure of the hard subprocesses. Such effects can serve as a test of the Standard Model (SM) and, conversely, they should be taken into account in future experimental analyses aiming at extracting possible signals of new p...
Downloads: 3
[texts]Trying to Catch the Elusive $a^0$ and More. Reactions Initiated by $b$--Quarks the Higgs Sector of ${\cal MSSM}$ - A. Ballestrero
We study the cross sections for the production of a neutral, intermediate mass Higgs boson in the processes $pp\rightarrow tq'\Phi$, $pp\rightarrow tW^-\Phi$ and $pp\rightarrow bZ^0\Phi$ in the Minimal Supersymmetric Standard Model ($\Phi=H^0,h^0$ and $A^0$) at Supercollider energies. The additional heavy particles ($t$, $W$, $Z$) in the final state can be used for tagging purposes, increasing the signal to background ratio...
Downloads: 1
[texts]Vector Boson scattering at the LHC: counting experiments for unitarized models in a full six fermion approach - A. Ballestrero
Unitarization models describe phenomenologically the high energy behaviour of a strongly interacting symmetry breaking sector. In this work, predictions of some unitarized models in vector boson scattering at LHC are studied and compared with analogous studies in Equivalent Vector Boson Approximation and previous results for the benchmark no-Higgs scenario. To perform such studies, unitarized model amplitudes have been implemented in the PHANTOM Monte Carlo in a complete calculation with six fer...
Downloads: 9
[texts]How well can the LHC distinguish between the SM light Higgs scenario, a composite Higgs and the Higgsless case using VV scattering channels? - Alessandro Ballestrero
A complete parton level analysis of ll + four jets l = e,mu and 3lv + two jets production at the LHC is presented, including all processes at order $\ordEW$, $\ordQCD$ and $\ordQCDsq$ when appropriate. The infinite Higgs mass scenario, which is considered as a benchmark for strong scattering theories and is the limiting case for composite Higgs models, and one example of a model incorporating a Strongly Interacting Light Higgs are confronted with the Standard Model light Higgs predictions...
Downloads: 7
[texts]Electroweak radiative corrections to hadronic precision observables at TeV energies - E. Maina
We illustrate the impact of full one-loop weak corrections onto b-jet-, prompt-photon- and Z-production at Tevatron and Large Hadron Collider (LHC)
Downloads: 8
[texts]Isolating Vector Boson Scattering at the LHC: gauge cancellations and the Equivalent Vector Boson Approximation vs complete calculations - Elena Accomando
We have studied the possibility of extracting the $W^+W^-\to W^+W^-$ signal using the process $us\to cd W^+W^-$ as a test case. We have investigated numerically the strong gauge cancellations between signal and irreducible background, analysing critically the reliability of the Equivalent Vector Boson Approximation which is commonly used to define the signal. Complete matrix elements are necessary to study Electro--Weak Symmetry Breaking effects at high $WW$ invariant mass.
Downloads: 7
[movies]Lok Deuda Album Mahesh Kumar Aaujiko DALI MAINA - Lok Deuda Album Mahesh Kumar Aaujiko DALI MAINA
Lok Deuda Album Mahesh Kumar Aaujiko DALI MAINA
Keywords: Lok Deuda Album Mahesh Kumar Aaujiko DALI MAINA; puspa
[texts]Perturbative rates and colour rearrangement effects in four-jet events at LEP2 - A. Ballestrero
An important issue in the direct reconstruction method of determining the $W$ mass from $q\bar q Q\bar Q$ events at LEP2 concerns the impact of the relatively unknown QCD interconnection effects. It has been suggested that a study of `short string' states, in which colour singlet states are formed from $q \bar Q $ and $Q\bar q$ pairs with small phase--space separation, could shed important light on this issue...
Downloads: 1
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